Abstract
The newly developed 600 MHz 1H NMR Spectrometer is used to characterize coal-derived liquids and their chromatographically separated fractions. The distinct and well resolved proton resonance lines in both aromatic and aliphatic regions and IR analysis have been used to identify the major compounds and compound types. Double resonance technique has been applied for the chemical shift identification of donor protons (α-Ch2, β-CH2) of partially hydrogenated polynuclear aromatic compounds. An NMR difference technique is applied to determine specific compositional changes in upgraded liquids derived under identical process conditions, but from different coal sources. High resolution proton nuclear magnetic resonance (1H NMR) spectrometry has been used as one of the major spectroscopic tools for chemical characterization of coal-derived materials, since Friedel (1) and Brown et al. (2) reported 1H NMR spectra of coal-derived asphaltenes and low-temperature vacuum carbonization products. Based on the quantitative proton distribution data, structural information for complex
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